Again, sorry for your loss.
This is something I was going to do a few years ago. I even started analysing my left (fretting hand) position whilst playing and tring to copy it with my right.
I just flipped my bass over and tried to do simple things. I was going to buy a left handed shortscale, to see how it went
I didn't bother in the end but it is worth doing and I often think about trying it again. Imagine how cool it would be to flip to LH when playing a beatles song or two
I did actually meet someone, a few years ago, who was learning to play left handed because after a badly undiagnosed broken wrist (his dad was a Dr. and said it wasn't broken) he couldnt move his wrist properly after it had healed, so he chose to start to learn LH
Give it a go for sure